Harmonizer vs Sequencer Rack 1
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Harmonizer
This app helps infants develop perfect pitch by playing Shepard tones, aiding in pitch identity development. It also facilitates the study of chord relationships and displays the pitch of your singing.
- Shepard tone playback
- Pitch identity development
- Chord relationship study
- Vocal pitch display
- Infant music education
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See and hear how music fits together. Harmonizer turns musical relationships into a colorful, interactive grid. Tap a hexagon to hear a note, or tap the triangle between three notes to play a major or minor chord. Sing or play a single note on an instrument, and watch the detected pitch light up. EXPLORE NOTES AND CHORDS Discover how neighboring notes connect through perfect fifths, major thirds, and minor thirds. Major and minor chords form triangles, making harmony something you can see, hear, and explore with your fingers. SEE YOUR VOICE Use the microphone to highlight the pitch you sing or play. Listen to a note, try matching it with your voice, and explore the connection between sound and color. CHOOSE YOUR LABELS Show note names or Movable Do syllables, with your choice of tonic. Keep labels visible, show them only when notes are active, or hide them to focus on the colors and sounds. EXPLORE YOUR WAY Choose from playing, pitch detection, or a mode that listens when you stop playing. Adjust the grid size to suit your screen and how you like to interact. HEAR HARMONY DIFFERENTLY Harmonizer uses Shepard tones—layered sounds that emphasize a note’s identity without a distinct octave. Every hexagon with the same note name produces the same sound. For curious beginners, students, teachers, and musicians, Harmonizer offers a hands-on way to explore pitch, chords, and musical patterns. No music theory knowledge is needed to start: touch a note and listen. Pitch detection requires microphone access.
Sequencer Rack 1
Create music and beats with a step sequencer that resembles a compact machine. It offers 16 voices across 16 patterns, with various sounds, effects, and playback controls.
- 16 voices and 16 patterns
- 16 diverse sounds (drums, synths, guitars)
- Chord and synthesizer pad functionality
- Phase and virtual speaker effects
- Export to WAV
- Sound pitch and playback control
- Tempo and volume management
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Sequencer Rack 1 is step sequencer app looking like a small machine. It has 16 voices that can be used in 16 patterns. It is very easy to create music and beats with it. However the sequencer has its limits. Features: - 16 different sounds including drums, synthesizers and guitars - Chords in D major - Syntesizer pads that can play the current chord - 2 effects (phase and virtual speaker) - export to .wav file - sound pitch control for every sound - can play sounds backwards - tempo BPM control - select beats per minute - volume control - can play in loop - pads volume control
Screenshots
Verdict
Harmonizer and Sequencer Rack 1 both sit at 4.1 stars, but that hides the real split: 45% of Harmonizer's written reviews are positive against 0% of Sequencer Rack 1's. Harmonizer also leads on price (Free vs $3.99) and in-app purchases (none vs 1). Sequencer Rack 1's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 17.0). On rating and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Harmonizer is free to download; Sequencer Rack 1 costs $3.99 up front. Sequencer Rack 1 sells 1 one-off in-app purchase. Harmonizer asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.1 for Harmonizer against 4.0 for Sequencer Rack 1. That said, the two scores are not equally well evidenced: Harmonizer has 16 ratings behind it against 2, so its average is the more settled of the two. Written reviews are what separate them: 45% of Harmonizer's written reviews are positive against 0% of Sequencer Rack 1's.
Harmonizer ships an update every 33 months, Sequencer Rack 1 every 91 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.
| Parameter | Harmonizer | Sequencer Rack 1 |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.1 (16 ratings) — better | 4.0 (2 ratings) |
| Positive reviews | 45.5% of reviews — better | 0.0% of reviews |
| Number of ratings | 16 — better | 2 |
| Update frequency | Every 33 months — better | Every 91 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Paid |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 3 MB | 26 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthew McLaughlin | Aleksandar Mlazev |
Customer experience
Harmonizer
Sequencer Rack 1
In-app purchases
Harmonizer
No in-app purchases
Sequencer Rack 1
- Sequencer Rack 1 unlock export$1.99
Questions
Is Harmonizer free?
Is Sequencer Rack 1 free?
Which has better reviews, Harmonizer or Sequencer Rack 1?
Do Harmonizer or Sequencer Rack 1 have ads?
Which is updated more often, Harmonizer or Sequencer Rack 1?
Other comparisons
